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yeah, as long as the belt groove lines up with your crank pulley. or you can use a bushing on your 5/8 shaft to take up the slack in the 3/4 pulley .. theres plenty ways to skin that cat .. BUT it absolutely must be a SHORT pump..the 3/4 shaft pumps were considered heavy duty .. but pumps are much improved since those days. I run a Hi -Volume Edelbrock Aluminum pump on my stroker
 

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A couple of days ago I was reading an article on the ZZ4 crate engines and found they fall far short of their advertised 355 hp. The test engine only made a dismal 318 hp because of it's whimpy cam and cylinder heads. if I recall the cam's duration was 208/221 which makes it a very mild cam; certainly not a cam capable of making 1 hp per cubic inch. There is a 385 hp version of the ZZ4 that would be a better choice if you're wanting good performance.
 
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