I've used a couple of sets of Harland Sharpe roller rockers with no problems. Jegs and Summit carry them for about $200.

You will need guideplates, use 3/8" guideplates and push rods. Don't buy the push rods until you have the heads done, on the block and can use a push rod length checker to determine what length you need. Most people have .125" taken off the rocker seats to compensate for the guide plates, about $35 when they're at the machine shop.

Consider a new set of ARP rocker studs for your assembly. The original studs are 30+ years old and $40 is cheap insurance.