170 or 225?

Motorcraft 2100/225/904 is gonna be a really nice combo. Y'didn't ask me, but y'might also look at HEI ignition and Dutra Duals, and speaking of Dutra, you can get his RV10RDP excellent-street-driveability camshaft easily and inexpensively from Oregon Cam Grinding as their grind № 2106R.