I have header flanges available if you want to make a set of tubular manifolds. If someone is in florida, I have a guy that will make a set of headers for a good price so we can offer them to everyone. Just throwing it out there since I don't know what you are up to with the exhaust.
The older 3100 heads have a 1.72" intake valve and are a worse casting quality than the 00+ and 3400 heads used. Head castings ending in 170 and 487 are the ideal heads. 487 being newer and either 10mm rocker studs or 8mm. 8mm was changed in late 02, officially 03. All 3500 heads are 8mm.
Any more questions, let me know. I like forums because then everyone can see the discussion and get the answers
