The 670 will be fine up to a point. Really need to know some specifics before recommending more carb. Intake, cam duration, exhaust, compression ratio?
Lots of bad advice floating around about ignition timing. Do your homework. Use the search function.
As I stated previously though, due to the excessive mechanical advance on the stock distributors, they really need to be re-curved. Setting initial timing at 14 might give you way too much total timing. The stock curve is set up for lower initial timing to give better idle emissions and easier cranking. There are several ways to limit mechanical, either by modifying the slots in the stock-type distributor, or using an aftermarket unit with an adjustable curve. Also, disconnect and plug the vacuum during your initial tuning. That's strictly for fuel economy and should be tuned in last.