Nice combo TransAm 474 ! Seems there are quite a few running a stroked 78/79 w72 . I have one ...bent wheel bob on this site has one too
Here's my combo (almost same as yours)
1978 400 XX WC block
Bore- 4.21"
Eagle 4.250" crank
Eagle 6.800" H-Beam rod
Mahle pistons and rings
Melling 60 psi 3/4" pickup
1978 stock 6x-4 heads - done by SD Performance ..CNC ported 260 cfm, 7/16" Studs, Ferrea Valves?
SD Performance Stump Puller roller cam 230/236 at .050, .567/.578 lift
Comp hyd rollers - no issues / ticking
crower 1.5 steel rockers
sims roller bearing timing chain set
original qjet- has elec choke, used Cliff qjet kit...his kit top quality..and got Cliff's qjet book for tuning (use one of his recipes)
Stock Cast Iron intake
original HEI distributor
1 3/4" headers, dual 2.5" exhaust
Super T10 4-Speed Manual transmission
canton road race pan
mcleod scattershield
center force DF clutch
original 3.42s
I figure my Compression ratio is around 9.25:1. When I got heads back from SD Performance I cc'd em. I seem to recall they
were either 97cc or 99cc? little more volume than i figured. I had original Super T10 rebuilt by local guy - he used a good kit.
Tranny was in good shape. But nothing special like better gears or cast iron side plate. I am little paranoid about the Super T10. It shifts fine and I beat on it a lot. But , Im not sure how much abuse it can take.
I have only had car at 1/4 track once. It ran 13.70s at 108mph. I had zero traction coming out of the hole - car will just blow away the tires when launching. I have old hard 255/60/15 tires that are likely pretty crap. I try and get into throttle gently
while on edge of breaking loose. I think my car weight is around 3550 lbs (3750 with me) Car has no ac , no pw or pdl, tilt.
Fairly basic 78 ws6, w72 , 4 spd car - though has deluxe interior which I like.
I have to say from around 60 to 120mph...its awesome
I have it in 4th - at 60mph the rpm is around 2900?.
and then foot on floor and max to about 5500rpm. My tach sticks a bit. So, sometimes needle is pegged at 5500
Only on nice straight highway at night
Also had to add pusher elec pump. Was kinda falling on its face at high rpm
I added carter elec by gas tank and that resolved. I use stock fuel lines and return line with big can stock type
mech fuel pump (from napa? like $40?). I use STP SA136 air filter - 3" height and $10 at autozone. My shaker is original
and not opened.