307's were a good engine but got a bad rap as people tried to do things that they weren't meant to do...same platform as other small blocks..the consensus is smaller cu in less gas but sometimes that works just the opposite...especially in a heavy vehicle.. the 350 and 305 are the same stroke 3.48...go to a 327 and they are 3.25 stroke so less stroke and same bore as the 350 which is 4in....you don't need a 4 bolt main but if you think you do then find a 4bolt 350 block put a 327 crank in it...350 and 327 rods are the same 5.7 in and then put in 327 pistons...wrist pin is in diff spot as compared to a 350 piston...this will give you a nice engine and you can cam it to where the power band is comparable to the rpm your turning at hiway speeds... if you can find them casting number 882 heads are a heavy casting instead of the lighter ones that cracked....194 intake valves are fine and if you want to splurge 84 5 and 6 corvette aluminum heads fit also and are fairly cheap..this will take some weight off the front end...use a 600 vacuum secondary holly 4 barrel and jet it to grey on the plugs with a strong secondary spring in the pot so it doesn't open to quick as to flood the engine...a good hei with an aftermarket coil will provide plenty of spark for your application...and you didn't say whether its an auto or standard..i would look for a 5sp out of a later truck if standard or an overdrive auto and that will help
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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