Ok what have people done with making custom headers for these engines? The nascar headers I have are 1-7/8 stepped to 2. The primary tubes are 21" long. Then into the usual nascar Tri y collector. The original nascar headers are thin wall tube, in the 0.035 area or there abouts.

As none of the original headers will fit in my car im going to make my own. We are very limited over here in Aus on thin wall material so im going to have to use 0.060 wall 304ss. I'm thinking of making them 2" stepped to 2-1/8" 4 into 1 with a 3-1/2" merge. Primaries still at 21".

Just like to know what everyone else has done.