[Bob Carriere]

Hi Jordan

You may have a very good engine in that 75 250????

You really need to track down the serial number near the distributor and the casting numbers on the side of the block and the heads.......

Your best bet is to pull that six out of the truck...... don't give up on the auto tranny..... it may be cheaper to fix that six and the tranny than the $3500 to rebuild a 261.....

Your challenge will be to clear up enough sheet metal on the cab 13 to figure out the fit..... critical willbe distance to clear the fan to original rad mountings... or move the rad forward slightly.....

You need to measure the lenght of the auto tranny to transfer case... you need enough room for a specail fabricated sliding drive shaft..... or shop around for an auto from a van that will have a significantly shorter rear horn on the auto tranny.

Get familiar with the Stovebolt web site... they are experts i the wings there that can help you with even specific GM parts number.

If you know the exact year of the trucka GM book form the library will tell you everything youned to know about the engine.

The reason I am so hot on the auto tranny is you will not have to worry about the 216 bellhousing to fit.... which I do not think it will even with some of the old freindly "adapter plates... cluthc is on wrong ride .. so is starter....

Pull out the engine... fabricate an engine stand... better still come to Ottawa in August and I will personnaly give you the front end of a scrap C13 frame to practice on and use as a test bed......

... and if all else fails...... I will buy the whole truck from Grampa as it is the eventual comversion I plan on doing on a fun German Fieldgrey "Umbau-wagon" cab 12....... should I live that long...

Try it..... you might like it....... and let us know how you make out.... consider making a web site devoted to that conversion.....

Bob C.