250 l6 Build ??

I am in the machining work stage of building a 230 with a 250 crank. Looking for do's and dont's . I have the leo santucci book and it gives plenty of info on building a race motor. I am wanting to build a good street usable motor with a little extra kick. So far the block will have to go .060 over. The head will be milled .060 to raise the compression a bit. I understand that you can use 307 flat top pistons to raise the compression as well. I keep reading not to use a clifford manifold because it leans more to high rpm power gains and the offenhauser is better suited for mid range torque. Then I read that the clifford headers are good yet they don't seal well and don't match the intake well causing the intake to leak.
All input is welcomed.

I have never had a problem with any Clifford parts. As far as the headers are concerned I don't think they are the problem, I think it is the gasket they recommend and sell. They get hard and brittle and fall apart. I won't use them.

whopman,
You might want to get this manual. It really has some great info and idea's. I found it very helpful when I rebuilt my L6-250.

Dan


http://cgi.ebay.com/ebaymotors/Chevy-Inline-6-Engine-Power-Manual-194-215-230-250-292-/170532306865?pt=Motors_Manuals_Literature&hash=item27b4847fb1