I agree with the above boys -- not much point in rebuilding and having a 350 when you can have a 383... and tq difference is off the charts vs the $$ - you can go with less cam and have more power.
I'd call Comp Cams and ask them about towing - gears - motor/trans combo and using their "THUMPER" - they have three versions - I'd think of sticking to the smallest one. They are supposed to give you the thump thump without the bump bump.
Also - no real reason to use the Vortec heads unless you already have some parts to be used for them... So I wouldn't limit yourself to just one head style if you can pick up a deal on something else. Eric is right - prices have come way down.
Also - a couple of the best motors I've ever built - were nothing but copies of something the pros did. I knew exactly what parts - exactly what cam - heads etc. Look at the numbers for an engine builder... Edelbrock comes to mind - they have several engines based on the 350 - and see if there's one with numbers you like. Then you have a "known" commodity to copy.
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