Cliffs FTW.

Me and a friend have HP tuners. He wants to know, for tuning purposes:

How many degrees, with respect to crankshaft TDC prior to the intake event, does the intake valve START to open?

Just in case it's needed: He says fuel injection timing should be modified from stock settings since duration was increased, the injectors are spraying fuel too late in the intake event.

Thanks for the help in advance!

Car Details:

98 T/A LS1 W/VRX3 Cam by Vengeance Racing (226/225dur .585/.588 and 112LSA)