Thanks for the comments. The trans I'm using is the Road Race version of the Tremec TKO. Its got a heavier 3rd gear and some other small changes and its got a little lower Overdrive ratio.
I'm running a 4.10 Ford 9" rear with a Powertrax center section.
Scattershield, clutch, hydraulic throwout bearing from McCloud in California. McCloud had done a lot of work on the Stage II Buick motor years ago so they were a natural to get everything to bolt up to my "Big" block 4.5 liter motor
As to the comments about forged pistons. Obviously they are a good choice. But they are not as exact in their dimensions as a cast piston. The sizes will tend to be slightly different as will the weights (which can be fixed).
One last comment. I knew a young guy in Florida that would buy Chevy 350's out of the junkyard (two bolt mains, cast pistons, cast crank) and put the motor in an old 4 door Impala, hook up a HUGE shot of nitrous (he knew what he was doing) and the car ran high 10's. Once in a while he blow a piston (not hyperuteptic) and simply bolt in a new (old) motor then go race again. VERY inexpensive and he NEVER broke a 2 bolt main cast crank. Never...
So a lot of this stuff is overkill especially in a light car like the Cobra.
Regards,