I recently bought a '72 chevelle with a 350 engine in it. The block casting # is 14016379 and it has 305 HO 58cc heads casting #14014416. I'm thinking about rebuilding it because it's a little weak and burns oil. It has an Edelbrock Performer intake and an Edelbrock Q-Jet carb. I'm not sure what cam it has in it, probably stock. I am a little new to engine building so I am having a buddy help me out with the rebuild. I want to add some power to it so that I feel like I am driving a muscle car (maybe 350 horses). With a budget of $1500, what would be the best thing to upgrade to give me the performance that I want. Are the heads okay or should I upgrade them? Thanks for any advice.