I had a 347 in a '66 coupe that I raced a couple of Fun Ford Street Stang class ( 12.50 heads up) events out here in the west and won. Ford X heads , B303 cam, headers, Cobra dual plane , 715 holley , C4 with stock converter, 4.30 gear 275 drag radial. Through the mufflers it ran 12.5's at 110 all day long. With the stock converter it was not good at idling in gear. For a true 'cruiser" I like the factory HO cam and 1.7 rockers. I will sound good and melt tires at will. Who cares if it goes 110 in the 1/4? That's why I have a race car.
'66 GT350H-3 time cover car - Car Craft July'77,Modified Mustangs and Fords Feb2011 ( w/article), Mustang Monthly June 2014. Bracket raced by me for the last 42 years. Yes it is a real one.
'68.5 R code GT fastback
'67 Ranchero 408W -427 glass hood
'78 F350 "Oleynik" car hauler