longbed wheelbase is 125" unless you have a 9ft bed (very rare, you probably dont). s10 ext cab is 123, close enough for the girls I go out with.
you are going to install the 235 in the s10 frame? that sounds.... interesting. I dont know if the 19x22 universal rad everyone uses with s10 swaps will work with it but I would guess so. you may need some funny looking hoses.
I like bowtiebits for patches,
http://www.bowtiebits.com, but they are in town for me.