Re: 478 custom flywheel
I would not swap parts around between a 305 and 478, if they are running fine run them the way they are. The information I found here says 305E weighs 795#, 478 weighs 925#, that's only 130# more for 173 more CID. Ford's newest World Beater V-8 is 7.3L, 444 cid, you will have that beat by 34 cid. Ford has EFI, and lots of other new bits and pcs, BUT I've heard BBlockV6's truck idling on video and it sounds awesome!
Your truck, a 3/4T will be fine with that 478 in it.
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