Re: 302 going 347 with blower??
As far as heads and intakes, I like proven packages. Holley system max upper/lower and heads. Also Edelbrock has a great intake and head combo and don't forget Trickflow. As far as blowers are concerned the cubic inches of your motor has nothing to do with weather or not you can use one, Although attention to compression amounts is a factor (keep it low). Its the vehicle year and choice of manufacturers and head unit. Paxton, Vortech, powerdyne, Kenne bell, etc...
What is the car mostly gonna see track or street use ?
Best of luck write me if you need anymore info.