427 vs 428
I guess I didnt exactly make myself clear on this debate. In the late 60's most of the major Stock car guys supposedly opted to use the 428 internals in the 427 side oiler block, for the reasons I mentioned earlier. Fact is a lot of vehicles that were tagged as having 427's did in fact actually have 428's, which are both from the parent FE block, Cobras included. From articles I read back in the late 60's, concerning stock car racing, particularly, the 428 guts in the side oiler was a popular combo, and the Ford gurus of that time, in engine building is where I got the info that the 428 combo was the preferred bore stroke combo.
As for the higher RPM capabilities, I guess its a matter of preferance. but then in the half dozen 302's that Ive built over the years, I used 289 rods with pistons that were cut .065 off the deck. If you remember the Boss 302, it had the same rod length as the 289. Dont get me wrong, the 289 was a great engine, as I have had a few of them, but I will stick with the 302. Ive easily spun 302's as high as I did the 289's, both with and with out the slightly longer rods. Please dont forget that somewhere around 71 or 72, the manufacturers changed from flywheel horsepower ratings to differential ratings, which gives the engine lower output numbers. The rule of thumb we used to use was to get the flywheel horsepower of a differential rated engine, add about 50 horses to the figure. This was to compensate for drivetrain losses.