What do you mean by done in regards to the heads?
If they did not get all new guides and valves besides a valve job then they are in no better shape than the 6x heads pretty much,unless the 62s where also decked to clean things up.
I would CC the 62s to see where your at,most of these are 74 to 75 CCs.
If you unshroud the chambers at the sides to match the fire ring and releave the reverse curve in that area on the intake valve side(this extends around to the spark plug somewhat) you will have a 78 to 80 CC chamber and a workable compression ratio, if not that by all means do up the 6X heads.
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