I hate to sound dismissive , but it sounds like you may be "over thinking " this. Sounds like the suspension is just way too stiff for what your hoping to do and you've already mentioned that the rear body sits higher than you want. Sounds like a simple spring replacement , (maybe 4 leaf) would...
Was really hoping for 340 performance and durability , kinda like my Duster from high school. Ah ! The good ole days ! Guess I had to settle for affordability instead. LOL !
It's actually a .40 over 360 with lots of goodies. Looking back at the build , I probably could have bought the assembled 408 at Summit for less, but half the fun is the build. Really wanted a 340 , but good luck there !⁷
Thanks for accepting me and don't let the Infiniti name scare anyone off. My retirement from Nissan/Infiniti was proceeded by several years as a technician in a Dodge Dealer as well as several seasons in an AHRA Super Stock Dodge Charger. (Guess that dates me by a little !!) My current project...