383 440 swap. Same flywheel?

Hope the storms didn't hurt anyone yesterday.
I'm back for more experienced help.

Here’s my conundrum.

I’ve already got 600 dollars in what is supposed to be a “low mileage” 440 RV engine. Bought it before I knew about the cast crank pilot hole issue.

I’ve cleaned up, changed over the oil pickup and pan from my donor 69 383,

I’ve got the input shaft and register bearing issues solved for the cast crank 440 so I can try it.

I’ve got the neutral 143-tooth flywheel off of the 383 to go on it along with the pressure plate.

I’ve been told by an engine guy who I asked to drill the flywheel to balance it for the 440 that it doesn’t always turn out so good as far as being balance correctly.

If I drill my flywheel and it doesn’t work or IF the engine turns out be no good, I’ve “ruined” a perfectly good neutral balance flywheel.



And IF the engine turns out to need work, I would give it to someone and have them put a forged crank in it anyway and then I would need a new flywheel because I would have “ruined” the flywheel that I have.

So my question is does this work?

FWCB017 FLYWHEEL COUNTER BALANCE WEIGHT 383-400-440 CAST CRANK
Details


Flywheel counter balance weight, used to convert McLeod flywheel FW102 or FW202 from neutral balance to 383-400-440 motor with cast crankshaft/external balance. Weight package with mounting screws.

Price: $29.95







I would buy it and the flywheel and try it. It won’t bolt on my stock flywheel, right? I don’t see any extra holes on mine.



At worst case I would have to perfectly good neutral balance wheel which is one more than I actually need.