getto
+1y
got a hydro boost and a 327 doored on 18s and 20s...would never get a 7" my buddy was stock floored on 22s in a second gen and said he could never get the spongy feeling out of his 7" and one of my club members has a second gen 4.3 99 on 20s and he hates his 7" and is trying to by my spare hydro boost...so i say hydro boost....also you will need the booster out of a 95 or older astro or a dually or 1 ton extra cab..the 96 and newer astros have a canted booster, u will have to make a plate to "shim" the booster so yopur pedal lines up. on my 1st gen i didnt have to cut the rod cause the way i built my firewall. and if its bodied on 22s, u prob. might be able to build to suit for it...and as far as lines go look up the thread on s10 forum, as useless as that shit talking site is, i did manage to get the aeroquip adapter sizes from AN to NPT and i ran fresh hydro lines to ensure all new fresh stuff, you will need some 90s on the steering pump output and the booster imput, [at least i did to clear my master cylinder and wheels] and the t is done the same as tated above, but i would do the new fittings and hydro line..its your brakes and shit....dont need to come up short there over 18 bux in fittings and 40 bux in hydro hoses...