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some pca events require a porsche motor in a porsche chassis so even though the 924 motor was shared with other makes, it would satisfy the rules. a type IV motor was a VW van motor at one time so i don't see what's so bad about a porsche derivative of either motors, type IV or turbo..... both are about 30 yrs old...
the payoff to install a 924turbo motor would
never equal that to putting the same amount of work/money into a Type IV...it would be a conversation piece so that others could say "ooooookayyyyy, whatever floats your boat"
I looked at all the different P-car powerplants for the same reason, none of the "alternative" watercooled powerplants made for a good swap in my opinion.