for 450 hp you dont need to add anything to the ls1 imo. Its been proven it will hold over before any internal stuff needs to be modified, unless you just feel like doind it. the column shifter will work, or a floor shifter. there are a few good places to buy motors in Tx, but doesnt do you much good. i think the alternator will work, dono about the rest. I ran the 5.3 ps pump and acc. in my s10. but i know all the ls1 stuff is a little diff. welcome to the site.