I am working on my 69 Cougar, with a 361W. I got started on it last October/November, before I moved everything to Colorado. The basic build is a .030 over, .010 over under with a retrofitted roller cam. Trick Flow 170 heads, (I know now, not big enough) and a 670 Holley street avenger. The rear gears are a 3.89 behind a T5. The cam specs out at .513/.513. http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=894&sb=2 The last thing I need for my engine internally, is a set of push rods. I measured today.... 8.137 inch length. Seems like a lot to me, but Trick Flow said in their instructions that came with my heads that longer than stock PR's are required. I guess my question is, does it matter where in the firing order you start with the measuring process? I installed the light weight springs, and made a few rotations. Came back to it and did it again today, with a solid converted roller lifter. PERFECT center of the valve stem, narrow sweep. I have three extra sets of push rods around, I had hoped that one of them would be long enough, but nope! I see that I can get these: http://www.summitracing.com/parts/man-25811-8/overview/ For under a hundred, and then plus shipping. Do you see anything here that I may have done procedurally that is flawed? After my last go round with PR measurements, I just want to double check my method here.