A little more oomph

Looking like I gotta pull my heads for valve seals this winter so I’m considering putting a little more into it while it’s apart but still staying in budget. Currently it has Basically stock 72 318 heads. Engine is bored .030 with KB pistons, .470 lift Comp cam, edelbrock performer intake and 600 eddy carb. Stock 72 manifolds.

Looking at doing 302 heads (may put 1.88s in it and porting them), Holley 650, maybe some higher flow manifolds (maybe porting them, but that doesn’t seem to be a common thing?), and porting my performer intake.
It’s got an 8.25 with 3.91 sure grip and a 904 with 2800 stall. Just making sure I’m heading the right direction and not doing anything stupid. Hasn’t seen the track in over a decade, gets into a stoplight battle from time to time, and I like reliability as I regularly drive it around town. Open to suggestions but from what I’m reading I think these are good small updates from current setup.

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You dont need to pull the heads off the engine to replace the valve stem seals.
You want HP on the $cheap, add a 150 HP NOX shot kit.