you can buy new single port heads, would be chaeper than overhauling the ones you have, otherwise you could always put an advert in the for sale section and see if anyone has some 2nd hand heads.
i think the later twin port heads are around the $250 mark complete so im guessing a similar price for single port heads.
cant give a rebuild price as i dont know, but depends on your mileage
hope that helps
I recently priced some 1200 heads - Jax Heads in NSW (advert in the VW mag) has reconditioned 1200 heads for $210 exhange (or close to that)
I got hold of 6 heads all were supposed to be okay but when I had them pressure tests they were all crap - I ended up finding a decent head, but it cost me $200 (I was getting desperate) and after I installed it I found out about Jax.
At least I will know in future, but I would say give them a call.
Cheers
Peter
VW Toys
64 Beetle - club car - Herbie
RSK 718 Porsche Spyder
76 Southern Cross Offroad racing buggy. "Manx Buggies"
77 Cobra Offroad racing buggy "RipOff"
68 Country Buggy KO200
64 Manx swb
70 Dual Cab kombi
74 Dual Cab kombi
74 Micro bus