I've been racing one since 2014. 13:1 compression 3.750 on the stroke I think, comes out to 414. Have to clearance the block a little for the rods to clear, and piston #8 to clear the crank reluctor wheel. Also, weld that wheel to the crank. Mine came loose and timing/E.T. was inconsistent as hell until I pulled the pan off and the bolts to the wheel had come loose! MSD 6 Hemi Ignition is the cheapest way to fire it up. I suggest using a motor plate. aeicnc.com will make you one that you can run a big block chevy electric water pump on, a lot cheaper than meziere! TTI headers fit around the torsion bars if you're still using them. Also if you decide to use a double roller timing set, be sure to check the clearance between the timing wheel and the inside of the front cover.
Mine runs on 110 gas and does 10.0 in the 1/4, 6.4 in the 1/8 with a 727 torqueflite.
Pm me if you want more details.