another freaking engine build thread

I'll add - after some time to think about it - and bearing in mind this is just tossing ideas around - not based on experience with a 4.5" stroke...
I'd be very careful of setting quench. If the pistons are short, and the bore larger, then there's more rocking at TDC and you need to account for it. Also - static compression should be in the 10:1 range.
In terms of sizing stuff - I go back to this fairly often. It's simple ratios:
The factory stroke is 3.75. . The stroke you want to use is 4.5 or 27% larger. So the heads, intake, carb, and cam need to be about 27% larger just to emulate the power curve of a similarly built 440. A factory head goes around 230-240 range with a good valve job. 27% more is 292cfm. That's jsut to equal the stock port feeding a 440. RPMs (and Stealths) in OOTB form will go around 280 with a good valve job done to them. So you're closer, but still short. Consider them as a high torque head for a 543. SR-EZs will go a little better, around 295 as cast. But - they are still a std 440 port (runs any intake). You have to get to the larger volume, MW sized ports to really get something as cast which ends up a little over 300. Then you have limited intakes, everything gets bigger and taller so they don't fit under hoods, etc etc etc.