I don't think it's going to be worth it, depending on how well your 781's were done. Have they been cleaned up at all with a good bowl blend after being
cut for the bigger valves? That will help flow...
Although you would probably see a jump in compression...781's are usually around 119cc (although you need to check for sure) so 115 chambers would
bump it up a little.
But to be honest, I think your biggest hurdle is your engine size...a 454 or 496 could take more advantage of the higher flow of the race rites.
What kind of cam are you running? I've always heard a good solid roller can add about 50 hp compared to a flat tappet and that set up usually runs about $800-$1000.
Hope this helps,
Jason
PS. The race rite is an awesome head though.
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