My current dyno mule is a standard bore 440 with 68/69 stock cast pistons. Unfortunately, the block has ALOT of taper in the cylinders. On most pulls it's all done by 4500rpm, (turns into a mosquito fogger as there is no ring seal by that rpm.)
Mods to the motor are a mechanical cam, .495I, .519E, 239/246@.050 110 centerline. 1-3/4" headers, 452 heads with good valve job and home pocket porting. Compression is 11.26-1. Fuel is E-85.
The first pulls were with a '77 cast iron intake and my 850 E-85 thermoquad. Timing was set at 37 degrees and it made 344.9hp@4319rpm. (as I said it had a tremendous amount of taper resulting in so much crankcase pressure it pushed the breastplate gasket up to the bottom of the intake manifold.)
I switched to the MP M1 intake, and installed a another vent to the crankcase and plugged the PCV so I didn't have all that oil smoke recycling through the cylinders. I got the motor to run up to 4425rpm and it made 396.3hp.
I played with the secondary air door and got that dialed in. On one pull I was able to get it to pull to 4800rpm, it made 437.3hp@4791rpm and 488.2 ft/lbs.@4577rpm.
I know this isn't a stock motor but I believe the factory numbers would be pretty close to those that were published. Dave