Comp Cams will build a set of NASCAR-strength pushrods in whatever length you need, and they will install upper and lower hardware to be an exact match to the lifters and rockers. When I'm modifying a pre-848 235 head for more compression, I get with the custom department at Comp to fabricate pushrods with the right length and hardware.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!