[Slow-V6]

Just one quick Question. I have a set of 241's that I am looking to get worked. The 1 machine shop said it would be 800.00 p&p with a valve job and another Machine shop in collingswood said that they would just advise me in doing a Valve job for 250.00. I have a 228 228 cam and am just looking for around 400 RWHP. They said that a valve job and that cam it will get me pretty close to that number. Is this true? They told me they can get me between 10-20 hp from the valve job and that a P&P would only net me another 5-10hp for another $550. Right now My WS6 makes 340 rwhp and 350 rwtq. Like I said I only want around 400 right now. down the road I am going to do a forged motor with a great set of heads but for now I want a cheap build. So far I have spent 150 for the 241's, head bolts, and Cam. I still need springs and gaskets. Any advice would be welcome. Thanks.