[Alan Roehrich]

If this is a street pump gas engine, with no rules, you'd be better off to sell those heads to someone who needs them, and buy a set of small chamber Edelbrock aluminum heads.

A 60499 Edelbrock, out of the box, has a 100cc chamber, 2.19 and 1.88 valves, and flows 300 cfm @ 0.600 lift on the intake, and 218cfm @ 0.600 lift on the exhaust, with no work. All new heads and all new parts.

A good shop doing a 3 angle valve job, new guide liners, cleaning, milling, and assembling the 840 heads will charge at least around $500 labor. That's without hardened exhaust seats for unleaded pump gas (I ended up putting a full set of 16 seats in my early model BBC heads for another $300, plus redoing the valve job after trying to run old heads on unleaded pump gas, because it sunk several seats, intake and exhaust). That also doesn't include about $500 for new valves, springs, retainers, keepers, and seals.

I'm not trying to tell you what to do, just offering free advice from hard earned experience.