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they will git, but it will lower your compression drastically due to the size of the combustion chambers.
you will need the timing chains, cover accesory brackets etc.....
your best bet would be PI heads. they bolt right up, and with smaller combustion chambers, they increase compression and make great power.
would it have the same effect on t 99+GT cause I was thinkin about getting new heads and cams this summer. Any suggestions for brands and would I be able to do it in my garage?