Speed is $...

read all the stuff here:
EFISystemPro.com
Sniper EFI - Holley Performance Products Forums

An EFI can not cure any mechanical problems of an engine! You will need a laptop for tuning. First install with the hand held is ok. The sniper is well known for EMI, so be carefull during installation, take your time and follow the tips. There is a well known remote tuner in the Holley forum.
Good luck
Marco