Pushrod length for Performer RPM's/ stock cam

OK guys, I need to know what length pushrod I need to use with a set of Edelbrock Performer RPM heads part # 60229 (small valve-1.90"/1.60" stud mount non-emission) with a stock cam (turbo car) and Comp Cams Pro Magnum 1.6 roller rockers. I hope someone has a similar combo and can shed some light. Thanks everyone.
 
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