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You might check the availability of aftermarket pistons before moving forward. If you can find one that you can zero deck thats what makes these motors perk up.

Another thing to ponder is later 273's had cast cranks like 318's

The 2 bbl motors had flat tops with 4 valve notches and about 9:1 comp. The 4 barrel motors had domed piston with 10.5 comp. The HiPo's also had a slightly larger cam that was a solid lifter cam.The 1969 motor that you have is Low comp. and has the hydraulic cam so if you want performance your...

The combo you describe sounds like the same thing we used to run back in the 70's and 80's. The Holley strip Dominator with a good double pumper in the 750/800 cfm range will work well if its more of a racing application. On street and strip cars the Performer RPM will make more torque through a...

The X and J castings are the same. There was no difference except the years they were produced.The first J castings were the 2.02 valves and actually the T/A heads were a J casting with the pushrod holes offset to allow more porting.The later J casting remained the same except they started using...