For a streeter, and with no other changes, I ,personally, wouldn't spend the time, or the cash, for new FellPros.
You should already have enough power to spin street tires thru two gears;but at 8.5 Scr, I bet you really have to rev it up to break the tires loose.I hated that. I hated it because it sounded so Mustang.
There are two versions of that Mopar single pattern cam, and neither one is for an 8.5 street engine; and neither one is for 3.55s.
If you have an issue at low rpm, the X-heads won't fix that. IMHO, you asked the wrong question first.
If you really have an 8.5Scr engine, and you really want to keep that cam, and those 3.55s, and can't find or afford the 3.09 lowgear Commando trans, then ............ well;
I could tell you about my 292/.508 experiences in my 11.3 Scr Aluminum headed 367. The short version is I swapped it out in a hurry, for a 270/276/110 cam with lifts of .538/.549, and lowered the compression a tad, and would still be driving it like that today,18 years later, (because it had monster torque), except it began dropping lobes in 2004.Well, that's as short as I could make it.
