I don`t do porting in stages , I just do it right , it takes me close to 10 hrs to port a set of heads so I charge $450 to do a set , I have flowed similar heads the gains are 14% intake & 20% exhaust & no loss of flow from stock & the flow rises .100 lift to .700 lift , this doen`t include any amchine work , hard seats etc , I can get all the machine work done as well as new valves etc
I would be happy to do a set for you if you want , I should be able to buy cores here for approx the same cost a shipping
Let me know