Just an FYI, the older T5-basics that were in monte carlo's, cutlases, monza's, etc. are another option. These had the 3-speed + 2 pattern. There is one on the shelves of my local salvage yard, came out of a mid 70's Monza. $125. I know from first hand experience that they live behind 300Hp v6's and mildy built 283's. would bolt up straight to the 250's existing bellhousing

Shipping would be about $40