Sould work? Who is the convertor from?
More than just stall speed, they can be loose, tight etc to lock and make abig diff too.
I think you look decent buddy should do in 12s.
Suspension, tires traction etc are going to be key so that you have a great 60 foot time.
the 1st 60 is the most important for 12s and under..
On the heads I went with taller chevy narrow stem valves 2.08 intakes and spring seat etc to get perfect installed height. My cam is a solid crane and closer to 600 lift. I make over 550 hp at 6300 on my 416 stroker.
this is in a 64 Dart, she runs mif to high 10s, but still can not hook.
Are you installing frame connectors too?