Adding more carburation won't help that. Some fine tuning, like timing & fuel mixture might help some. If it was desined for a V-8, it may have a high overdrive ratio. Some of them had .068 ratio. Most are around 7.2 to 7.8. Some 4 cyl. S-10 trucks had .086 ratio. There should be a tag on one of the rear housing bolts with the tag on it. The ID no. is in the lower left corner. it goes like 1352-xxx. You can match that up to a chart & find the ratio's of the trans. & what it originally came out of.
