One of the most inportant things with a BBF is to have the right style of cam profile;ie Adv dur and @.050, valve lift, and with the BBF it seems to work better with more exhaust Dur and Lift. Right there you can see 30hp - 120hp. Alot of people run a strieght duration cam and are satisfied, but they would be much more happy with split duration style cam(more Hp). The Wieand Stealth intake is one of the best for all around use for the BBF. Heads are very important also. The C8-D0 heads very slightly from 73cc-78cc. The D2 head is a very durable open chamber design of 98cc with a real long short turn on the exhaust, but it can be remidied from mild port work. I have had very good luck with the D2 head, some may say they suck but they work very well and they are very cheep. The D3 head is a factory closed chamber design of 91cc-98cc, they can work very well with a good port job, there is enough room to cut them down .030 and that will help increase the compresion. Every body knows that one of the best piston designs is a flat top. The best design is the single valve relief for the BBF. Remember Lighter is better. If you have a 429 it is best to get a new or good used 460 crank before buying pistons, there will be a $600 diferance in a light wieght piston price. Rods are getting harder to find, that is CJ rods, but the truck rod is almost identical. Bullnosing and wedging the crank will also help with oil control and wieght, yes by cutting the crank it does through the balance off, but they can add the mallory closer in on the crank which helps. The bigger the bore the more compresion you will have. By picking the right matched parts it is easy to creat 650=HP reliable economical power out of a BBF.
Jim