LA 318 w/ Magnum Heads What Pushrods

I ordered the MP conversion pushrods for the 1st one of these conversions I did, they were too short. OEM heads and stock Magnum valve gear. I think MP ones were 7.625 and I ordered 7.650. Ordered the 7.650 for the 2nd one we did as well, they worked fine. or what ever the MP ones were, I ordered 0.025" longer.