I had gathered these parts over the last couple of years. I bought a whole pile of parts off a circle track racer getting out of the hobby for a steal. I took what was good and sold the rest for more than I what I had in it. One of the few times the hobby God smiled upon me. Ended up with the fully assembled N351 heads, custom(ish) forged flat top pistons (4.035) with H rods, forged 3.25" crank and a late model 302 block that had already been clearanced.
For some reason I got stuck on the idea of using these iron heads, not sure why. Got them for free I guess. Hindsight might be wishing I sold them, but what is done is done. 10 degree head, Yates help design the combustion chamber, supposedly really efficient. It can be milled a ton if you want to run a crazy compression. I had them ported and flow is respectable, not that flow numbers are everything. I had the pockets worked on to take the LSx dual springs to run the custom FTI cam. I got a set of Smith Bros. push rods and some 2.055 valves for a little more low/mid lift air. Throw in some link bar lifters and my free heads are now getting pricey.
Besides the weight, I don't think I'm at a hp disadvantage, lots of built SBF running these heads on the roundy round making some really nice power, just a little strange for the street.
The heads also required some thought for the headers, wide bolt pattern on the flange. A little help from Stan over at FPA fixed that. I got a set of Step down (1 5/8 to 1 3/4), uncoated. I'll have the ceramic coated once I get everything installed and test fitted.
I decided to go FI on this build. A Trick Flow Track Heat intake (little port work on the lower to match the flow of the heads), 75mm TB, 80mm MAF sensor, set of 42 lb injectors, chip tune and a Moates QH. Should more than handle the top end. And since I like shiny and not a huge fan of the comb-over intake, I had it polished. At this point I would go with something different, but I'm too far down the road to change my mind without losing my shirt on some of this stuff. I plan on running the CAI behind the shock tower so the tube will be a very short run under the hood. The rest of air will be supplied under the fender via the front valance. I have checked with Pro-M racing and they said no problem.
For the transmission I went with the 4r70w from an '01 V6 Mustang, using the Baumann computer for control. Shipped it to Phoenix Transmissions and let Greg work his magic. Should be good to at least 550hp. It's still in the box he shipped it back it so I have to wait a bit to actually get to see it. He built me a 9.5" Torque Converter with a stall speed of 3600 rpm. I sent him the cam specs and the rest of the required information, it sounds like a lot, but others I have chatted with say it should drive fine around town, the key being that it is a matched setup.
I plan on putting in an aluminum drive shaft, either one from a police crown vic or buying one already done. Still a little ways from that.