jc82gt

I am almost finshed putting together my 5.0 engine for my 82 Mustang GT. I am using a stock block that was rebuilt and bored .030 over. I have installed "World Products" Windsor cast iron heads with 2.02" intake valves and 1.6" exhaust valves, I have crane 1.6 ratio roller rockers. Can I use the stock pushrods or do I have to use the pushrod length checker to get the size pushrods I need or will the pushrods from Ford Racing Products that are made for 302 blocks with 351 windsor heads that measure 6.905" work? The heads I have used have 1/2" headbolt holes which is common for the 351 Windsor, I have gotton special bolts to mount the heads to the block.

If I have to use the pushrod length checker what is the easiest way to use this and get an accurate length calculation.

Any advice will be greatly appreciated, Thanks, J.C.