[69 Mach I]

I am looking at the receipts for my build and I have a notation for Comp Cams 8600 pushrods. I assume this to mean I have 8.6 inch push rods in there. I check the Comp Cams catalogue and notice that the standard length for a 69 351W is 8.150 and that you can go short or long by .050. It occurs to me that I might have pushrods in there that are too long, which could be catastrophic. How much work/time is involved to pull a pushrod out and measure it?