I need help in the way of facilities and know-how since I'm short on both. My existing 4 cylinder has a cracked block and my exhaust manifold may have a crack in it since there was some rust formed in the number 3 cylinder when my mechanic removed the head. A rebuilt engine with core will cost me about $1550 delivered, and I might need a manifold. Whatever else I may need in order to do this I'm not sure. My mechanic wants $600 to do the swap. Maybe that's a good price for this, but it just seems pretty easy seeing how it's a boat and not a car. Any words of wisdom?