I am not an FE expert, but just a fanatic with a few thoughts. First I have heard of taking the truck 390 blocks out to 428 specs but I would really hesitate to take a block out to 427 specs. Anyway, you are going to have to go in for an engine rebuild anyway and machine work, so why go back to stock 428 specs? If it were me (hoping one day) I would get the whole edelbrock FE package with the 750 carb. You are going to spend some time and money locating original FE parts that are inferior to moderm components if you want original. Build it closer to what you want to begin with or you will really spend the money on this project. But a moderately moded 428 should just crush most of those around you. Good luck with it.
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