Enginge/Trans opinions

[Keith6987]

I am getting down to decision time. My 69 Blazer did not come with an engine. I will probably go with a moderately built up 350. I have a TH350 that came with it and a 10 spline and 27 spline NP205. I believe it was a 4 speed originally. I have the clutch pedal bracket.. I have the gears changed out to 4:56 and I will run 35" tires. I kind of like the idea of going back to a manual trans, but I can live with an auto.
So... this Blazer will be an on road weekend cruiser and will probably never see the interstate. I would like to avoid a bunch of expensive adapters in order to use a five speed. (unless someone knows a combo that will work)

What are the opinions on these options.

SM465 using the 10 spline (is this trans worth the effort)

convert to a 5 speed (NV 3500-4500)

TH350 with 27 spline

700R4 with 27 spline

Or should I think about a complete modern LS and trans.


Thanks, Keith