Put the 2.055’s in?
Even more $$$.
Plus, Reworking used heads...... now you have more $$$ in normal recon work and cleaning.

Unless you find someone who likes to work for cheap money.......fully porting RPM’s, fresh valve job, bigger valves, I can easily see that going over $1200.
At 300cfm(I’ve never had one even close to that on my bench), you have a heavily ported, thin in some areas, street head with kinda wimpy rocker stands.

Brian at IMM could probably come up with a price for that job right off the top of his head for that.

Since I’ve never seen a 300cfm RPM head, I have no idea how much porting it takes to get there.

It’s a $1395 proposition at Hughes...... which includes 2.08 valves...... but milling the decks to get back to the original chamber volume isn’t.
Plus.... shipping two ways.
If you needed a spring upgrade as well....... you’re almost at the cost of the TF heads without even selling the Ede heads.

But....... forget about comparing the spring packages.
2.00” installed height and 1.560 OD available ootb with the TF.

Depending on what you already have for rockers, they might work on the TF’s.