Quote:
Originally Posted by jrcaprai
Personally, if you could find a good 87 or newer 350, they all came with Hydraulic Roller Cams... gives you a few more options, plus they come with the Single Main Seal, rather than the leaky 2 Piece Seal... a 350 over a 305 is good for 35-50 HP and about 50 Ft-Lbs torque, just by increasing the Displacement alone.
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Hyd Rollers were not standard until 96 with the Vortec engines. It happens but it is rare to find factory equipped roller in the TBI engines (87-95). All of the blocks are drilled and tapped to accept the stock roller cam equipment, but most truck TBI engines came with hyd flat tappet cams.
To the OP, you say you can see 5.0L on the back deck of the block, you may already have a newer one piece rear main engine. When they changed the block design to the one piece rear main seal in 86, they added the displacement in Liters in the block next to the casting numbers. If this is true, you could add a factory roller setup if you wanted.
As far as swapping to the 350, I would only do it if you had the $$$$ or the 305 was a goner. Its getting you around now, it just needs some maintenace. Fix it up, clean it up and run it until it won't go anymore.