The aluminum head or block repair is not cheap,and on a head unless you have a lot of $$$ in port work it may be cheaper just to replace it than fix it.It always ends up costing more than the estimate they give you.And to be fair to the repair shops some times you find more damage than you 1st thought when you start the work.
If I were you I would step up to the 440-1 heads,that way you would have room to go later.
PS It would not be a bad idea to if you go the 440-1 route to save your heads and look for a good deal on a used head to replace the damaged head.That way you end up with 2 sets of heads.