Valvetrain, anre you referring to valves, retainers, springs, etc....???
If you are referring to rockers etc, the Scorpions are hard to beat for the price and they work very well on the AFR185's, I like the TrickFlow 1 pc chrome-moly pushrods. If you want to upgrade spring and seals I need to know the cam specs...
when i say valvetrain set up i mean springs rockers and pushrods....the cam specs are kinda weak because i still have my performance speed density cam in it lift is 472 intake, 496 exhaust......duration 280 intake, 290 exhaust
The stock valvetrain in the AFR185's will be fine for that set-up. If you start to upgrade to a more aggresive cam or something with a asymetrical lobe you will need to upgrade the springs and valve seals.
I would still use the TrickFlow 1 pc Chrmoe-moly pushrods
If you are putting them on the 331 in your sig with the Probes (I assume SRS series, flat tops or dish) you will have plenty of clearance but it is always best to check.
Do you really have Eagle rods on a SCAT crank? Usually Eagle uses a 2.123" rod journal and SCAT uses the chevy 2.10".