The 400M has a big block bellhousing pattern so your tranny would have to be changed. Swapping to the 400 would be a big pain in the butt so I would figure out what is wrong with your 302. I had 351 heads on my 302 with a 175 shot, stock head gaskets, heads milled .020 and had no problems. It sounds like the heads and/or block are warped if you keep blowing gaskets. Hope this helps you.
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