pushrod length/measuring question

I bought my "67 Barracuda convertible back that I sold 30 years ago. It came with a brand new really well built 451 stroker shortblock. Debating on what heads to get for it. Want to make big power as the car is back halfed with 4 link coilovers etc.
What pushrod kit is the one to get?

-Shiny
Look or call 440 source they'll have the single check pushrod.
I'd Probably advise trickflow 240 or 270 heads to start for making great power. Sounds like a nice build.