Welcome to TGN...
I think loft is the most important aspect of the club, IMHO. Anyhow, I'd put your old trusty shaft into the new head. If it performs...great, if not just put it back into your old Nike and start using the old club again. This is probably your cheapest test...
You didn't say whether your 350cc head and the new SQ had the same loft, but I am guessing they are......



