i used a caddy northstar in a 55 nomad back in 99. we used a s10 2.8 liter 700 r4 trans , plus a spacer between the flywheel and torqe converter . keep in mind the water pump in on the front of the motor when in a front wheel drive , when you mount it rwd the pump in on the lh rear of the motor ! wiring harness was made by street and performance .
major problem is they are UNDER POWERED !
good luck