Issues...

[**grumpy**]

My 64 C10 has what's supposed to be a 86 305.
It has a aluminum 2bbl intake from...maybe 70s-80s
and a older Rochester 2bbl carb.

It runs alittle rough. There's no timing mark so we put a vacuum gauge on and it idles at 17-20 on vacuum gauge.
So timing is pretty close.
The intake only has 2 bolt holes, opposite from each other...which is weird. Carb has 4 bolt holes.
I'll post picks of carb. It seems like a big POS...


I've put about 100 miles on the truck. It just seems like it could run much smoother.

Then....there's the trans. Its a TH350. It shifts from 1st to 2nd to drive in 30ft. Really fast.
The vacuum is hooked to back of carb.
I've never had anything shift so fast. Its...boom..in drive.

Any opinions?
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[**grumpy**]

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[powerdriver 1958]

Trans wise the governor in the side of the trans may be the problem . If the donor came from something high geared ( 3:07 , 2:73 ) . It could do that if your truck has a low gear ( 4:11 , 4:56 )

[**grumpy**]

My truck does seem gear-bound. Havnt had it on highway yet, but it seems its gonna scream at 65 based off how it acts at 40-50.
And I have a 235-70-15 tire.
Doubt going taller is going to cut into gear much.
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[powerdriver 1958]

Governors are an easy swap on a 350 turbos , Might try that

[bama63]

i would also check the modulator valve if it has ever been replaced its most likely adjustable just remove the vacuum hose and inside the port is a small screw turn it clockwise a few turns to delay the shifts