essentially, it is the oil plan, the intake, and the headers that are extra. also, iirc, the head bolts are 7/16" instead of 3/8". it is possible to get it under a stock hood, but to do so, you might need an aftermarket k-member.
i don't know about vortech fitment and how much it sticks out though, sorry. there was a guy on here, parchisi, who had a 351 with a blower. i haven't seen much from him lately.
as to the hanky's concern about the pistons and rings, i have 2 comments: (1) most engine shops usually have a phone number you can call if you want to upgrade to forged stuff (or use a different cam or something), and (2) hyper pistons are more robust than some people think, especially if you tune it correctly (just look at all the guys here and on the other popular stang forums who have a stock bottom end and a blower).
i don't know about vortech fitment and how much it sticks out though, sorry. there was a guy on here, parchisi, who had a 351 with a blower. i haven't seen much from him lately.
as to the hanky's concern about the pistons and rings, i have 2 comments: (1) most engine shops usually have a phone number you can call if you want to upgrade to forged stuff (or use a different cam or something), and (2) hyper pistons are more robust than some people think, especially if you tune it correctly (just look at all the guys here and on the other popular stang forums who have a stock bottom end and a blower).