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If I was smart............sometimes Im not, I should follow your suspension build specs and just do the EFI conversion on the 508 with a TKO600 5 speed trans in the car.

Get the car sorted out and see how well I like that and figure out if I want to step it up to the next level with the twin turbos etc etc

Using your suggested suspension and brake package What kind of G's does your experience indicate what the 72 Runner would be capable of pulling on a closed track?

Thanks for the other links also.