The question cannot be answered. If the car is old and original and in good shape, a collector might place a high value on originality. So a V8 transplant would lower value. If the car is old and modified and rusty and beat up, a collector might not want it anyway, so a V8 transplant might add value, by turning it in to a fast car that's fun to drive.
Value is determined by the guy with the money.
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