engine's bolted to the motor plate, plate's fixed to the axle via it's own blocks & bearings.
it'll always stay at the same relative angle as the axle.
i don't plan on heims because good, large ones are $ even at shop cost and they never stay quiet, but really because if front mounted wouldn't give any lateral support, requiring a 3rd link i'd rather avoid.
ideally i'd buy huge ones and press axle bearings into them to use in back but it's not in the cards and monster size ones are bigbig money.
this is all about cheap/free for me.
i think wide, gusseted-at-tube front mounts will provide adequate lateral location given how light the yerf is.
if not i'll use a drag-style diagonal link to locate it.
i know precisely zilch about sprint cars as i never deal with them (but i do know they're fully badass
), but in my street/roadrace/dragrace world a panhard bar does two things: sets roll center height and locates a stick axle laterally.
on no setup i've ever seen has one been used to tie other components together for structural purposes.
you got a pic of that sprintcar setup?
i love seeing new (to me) designs.