I 3rd the RHS Torkers, all the 1.94 headflow figures I've seen at 28" of water have been 10cfm higher at .500 than the 2.02 RHS Torker heads. The valve lifts under that have an even bigger margin. These are on real world flow benches and not from RHS (who tests with a 4.2" bore, weirdos?) . However, they do flow 240-250cfm. Remember, larger valve does not always equal "better" or more flow. It's all about port velocity.
If you are going to port the runners and under the valve job, then the 2.02's would be your best bet but I don't get the feeling you are going to do that.
Retro fit roller cam and lifters can get real expensive, real fast. I think the cheapest set of quality retro fit cam and lifters is like $550 from Lunatti...not 100% on that though.
I've never tried it but seems like I've read that if you can source a late model Gen I with the lifter spider, then you can run an 87-95 aftermarket cam... again, not sure. Might be worth checking out?
If you research it and go that route, here's some cheap goodies (American made also)
Here's an Elgin mild roller in the neighborhood you are wanting and only $189. Would match the RHS heads almost perfectly (considering their flow rates under .500 lift)
Set of Elgin OE roller lifters $119