Hello, I am hoping to get a little advice from the 5.0 crowd. I have a 78 mustang II that I have transplanted a late 80's 5.0 H.O. motor into, and converted to carb (600 c.f.m edelbrock and manifold) and HEI distributor. I purchased the motor from a guy that had the block and heads rebuilt at a machine shop. As far as I know the motor was rebuilt using all the stock components (heads, cam, etc.) with the exception of high compression pistons. I simply assembled the motor (using my original timing cover and oil pan) and put it in the car. I am now looking for more power. The research I have done so far has pointed me to upgrading to aluminum heads and different cam. I am thinking about edelbrock E-street heads, but I get really lost in the specifics. I have a picture that shows the pistons that are in the motor, but I don't know specific details. I get confused when it comes to what would be compatible...would I have issues with valve clearance?....would I have to convert from the roller lifters to something else if I swapped the cam?, etc. Any advice would be appreciated. Even if you tell me that I am in over my head and should take it to a professional. Thanks in advance!