length of custom pushrod

So I'm measuring for pushrods, I have j heads milled .030 and .025 thick head gaskets, I am also running factory ductile iron adjustable rockers. I have 2-3 threads showing on the adjuster under the rocker (pushrod side) and I'm coming up with 7.125 long pushrods, does that sound anywhere near the correct number? Also the block has not been decked. Thanks for any help Aaron.