Double Check My Procedure Here..

[woodsnake]

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.

 

[rbohm]

no it doesnt matter where you check the pushrod length. whether you check it on number one, or number seven doesnt make a difference as all you want is proper rocker arm geometry. and if your geometry is largely different cylinder to cylinder, you have other serious issues to deal with.

 

[woodsnake]

I have a real good, narrow pattern, hopefully you can see it in the picture.

 

[rbohm]

then order the length rods you need.

 

[Rusty67]

What is the ratio on your rocker arms ? 1.6 or 1.7 ? Maybe that would account for the extra length needed ?