Yeah, going to have to go with a heavy duty front end... planning on power steering and disc brakes up front. I've tried to eliminate weight where I could... intake manifold, exhaust manifolds, timing gear cover, water pump. Didn't go with aluminum heads... I priced them and when I woke up on the floor I decided against getting those. It's just a warmed up 331, I don't think I'll have to worry about the front end coming off the ground.
I just hope it fits without too much cutting. With the notch in the firewall I don't think it'll be too big of a problem front to back.
Lee