As far as the C-6 goes, I thought it fit fairly well considering the size. Mine has a 2" BL and I hammered the fold over, but after we got it in there, it wasnt needed. My C-6 is bone stock other than B&M TorqueMaster torque converter (Im pushing around 400 out of my Stroker). Remember though, there are other things to think about (crossmembers and mounts, etc...)I have to run a mid 90's starter as well (69 block), as the stock starter would ground out against the headers and just keep on cranking.