MM built the shortblock for my 400 based 512. I used crane 3/8' pushrods, crane stainless steel roller rockers, Stealth heads, they spec'd out the solid flat tappet cam, Performer RPM intake, 830 Quickfuel street series carb, Firecore dist and wires, TTi 1 7/8" headers, TTi 3" exhaust with Ultraflows.

I'm still tuning it now, got the timing about right after lots of reading and searching on here, just need more jetting. Also just went to an RC9YC plugs from the RC12YC to help with the pinging etc. Seemed better last night after the changes. Spins through 1st and most of the way through second with 3.55 gears.....and a smallish tire. Stupid 66 B body wheel wells. Lol
Here's a vid after the first fire

http://www.youtube.com/watch?v=QkwCr9yTm1I

An association of men who will not quarrel with one another is a thing which has never yet existed, from the greatest confederacy of nations down to a town meeting or a vestry. Thomas Jefferson