Any gains adding 1.6 rockers to stock 273?

I have asked Dwayne Porter( Porter racing heads) several times about putting 1.6 intake rockers on my motor and he said he has rarely seen such a swap make a difference.
and I have only a 565 lift cam on heads that pull to 650.
so on a stock 273, it’s even more unlikely to make any difference.
standard bolt on and gears, or as has been mentioned, by a cheap 360 and toss it in, probably biggest bang for buck you could do.