Any gains adding 1.6 rockers to stock 273?

man, i'd be looking at maximizing what you have now: ignition, timing, carb, exhaust

in getting there, a deep diagnostic baseline would be needed: leak down test, cylinder balance test, compression test.

then at least you'd know if you have something worth tuning or more work to do.

i'd be throwing a cheap cam at something like that before roller rockers. you can get a repop melling 340 cam and lifters for about $300 or send your stuff out and have it reground for even cheaper. which would net you real, tangible results.

what's your current set up?