PTV clearance on stock 94GT shortblock

I'm running a set of ported GT40's (non-p's) (never milled, nothing like that) with a Comp Cams xe270hr-14 camshaft (.512 lift intake/exhaust). Will I be alright to run Crane/Ford Cobra 1.7 rockers or you think that would be too much lift for the piston to valve clearance with the stock pistons?
thanks

yeah after a little research it seems as if i may run into PTV clearance issues, so i'll just stick with the stock rockers for now, easier on the wallet anyway.