The AR5 5 speed out of a colorado is a good option behind mild v8's these days. Stronger for sure than a t5 and pretty cheap ($200-$400). The adapter plate does have some cost to it, but its about $1000 for the adapter plate, clutch, trans, slave cylinder combo. About what a T5 would end up especially assuming most are beat to crap and these AR5's are easy to get.
FABbot AR5 to SBC/BBC Transmission Adapter
Looking for an affordable manual transmission option for your gen 1 or gen 2 SBC/BBC build, but want something that can take a beating and doesn't break the bank? We got you covered! This AR5 to SBC/BBC adapter allows you to bolt up an Aisin AR5 5-speed transmission from any Pontiac Solstice...
www.fabbotfab.com