This was an economy engine and was never meant to endure the stresses of racing.The emphasis was weight savings and gas mileage , midrange rpms.
A thin wall casting the block is 61 lbs lighter than a standard 187 lb Pontiac 350 block
It has a lower deck than the standard Pontiac V8's
It does have a 4" bore diameter.(a plus)
The turbo blocks are supposedly stronger than the std. 301 block.
The 301 crankshaft weighs only 42 lbs because it is not fully counterweighted , only two, and has a 3" stroke.
Mains are 3" (like the 350 thru 400 engines), Crank pin diameters are 2".
The engine is externally balanced a the flywheel so a specially counter weighted flywheel must be used and is not interchangeable with the other Pontiac flywheels and vice versa.
The damper may be done the same way.Double check it for any signs of a counter weight.If it is truly a counterweighted balancer you must not use it on an internally balanced engine such as 350/400/455.
I thought I have seen ads for after market balancers saying they will fit 301 thru 455.I do not know for sure.Crank snout diameters will give this away too.
Timing sets, valve covers, fuel pumps , distributors,oil pumps , cams rocker, arms and lifters for the bigger enginges , will work in the 301.
Pushrods are shorter @ 8.12" length due to the shorter deck on the block.
Not sure about the oil pans , front covers and valley / push rod covers.
Piston pins are .938 to .942 dia.
Rods are "armasteel" and weigh 21.9 ozs.
connecting rod length is 6.050"
The cylinder heads are the biggest limiting factor for this engine.
Siamesed intake runners,1.72 intake , 1.50 exhaust.
They weigh only 94 lbs.
The intake manifold is a single plane low plenum design. which weighs only 24 lbs.
No after market intake manifold was ever produced.
The bigger engine cylinder heads will bolt on but there is no on the shelf manifold that will work with the geometry change because of the shorter deck.
A lot of fabrication and careful machining would be involved .
If a 326 or 350 crank were used special rods and stroker pistons would have to be used or turn the crank pins to 2.0" and try and make the stock rods work.
Could be real fun but you would have to be very realistic about the power levels and the life span of it.