A freind and I made a 410 engine out of the FE and it would pull. It was not a hot rod. I like what you can do with the Ford series FE engines.
Dave
They are very durable. When using the cj or scj heads with the 2.09 intake valves and 1.66 exhaust, you need a bore of at least 4.13 for good air flow around the valves. The stock 390 is a 4.05 bore. Stock 428 is 4.13 bore. Most 390s can be bored safely to 4.13 or even 4.16 but the blocks need to be sonic tested. Edelbrock rpm heads have stock valve sizes of 2.09 and 1.66. You can purchase the Edelbrock 427 bare head, and install the larger 2.19 intake valves. 2.19 valves need the minimum bore of 4.13 to clear the cylinder bores.
If you come up this way, I'll show you some trick FE stuff.