[Keithc8]

We have done some of the 460 style engines with the Victor JR in a few Superfoamce cars but I am not sure about the Factory Five. I would contact them about this and they should know. Like Brent said the strokes all cost the same so there would be no reason to not do the 4.300 to 4.500 stroke combination unless you want to kill some bottom end. I find that some of the guys feel that they have to much power down low and will go with the 4.150 stroke which does give a better rod angle and piston design. You can get the power out of any of the combinations that you want.
We have a nice CNC program on the Edelbrock heads that will flow about 390 to 400 on the intake side and about 270 to 280 on the exhaust. You want to have good flow in the .400 to .600 range since this is where the camshaft will be most of the time. We do a ot of these with a hydraulic roller set up but it does run more money. The 460 engines is one of the best bang for the buck engines you can build but some people do not like the wieght on the front of the car because they are a little heavy.

Good luck, Keith Craft