Magnum swap w/ A-833

well I am trying to swap my 98 magnum 360 into my 73 duster and would like to keep the A-833 in it. What do I do about the flywheel? I found that centerforce makes one and MP makes one, but up here in Canada they are both 2-3 weeks away and $500-$700. I found online Brewers Performance makes a weight kit to convert a neutral balance to a counter balance but does a bigger company that I could find stock in Canada with make these?

Or is there a different way?

I picked up the magnum from the junk yard and it didn't come with a flexplate/flywheel so how would I get my neutral one balanced at a shop?