The second motor I had dyno tested and did some minor tuning on was a stock stroke 440 bore to 4.350, .030 over stock, I used the Speed Pro stock replacement 6 pack forged flat top pistons with 4 valve reliefs making 9.4 to 1 compression ratio for CA pump swill with a set of 906 heads that had a tiny bit of work done on them, mild Comp Cams hydraulic flat tappet cam with 1.5 ductile iron adjustable rockers and a stock 1970 cast iron six pack intake and stock Holley 1970 automatic carbs with stock jetting.
That motor made 430 HP at around 5900 RPM(no dyno sheets now, it was done in the late 1990s) and drove really nice on the street, it was in a 1970 Challenger 4 speed car with 3.54 gears in the Dana 60. I'm sure someone before me had worked on those carbs to get rid of the bog when the outboards carbs opened up to fast
I've had a bunch of different six pack carbs and intakes on 340, 383 and a bunch of 440 motors, the stock ones bog bad if they open up to quick