I'm not positive, but I think those valves might hit. Also, what manifold do you have-the performer rpm's might be a tad large unless you have a decent manifold. I installed that same cam on a stock shortblock with 1.6 rockers and edelbrock performer heads with no problems, should work easily with the GT40's too like the other post said. Plus, how can you beat the price of GT40 heads!
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