Well i didnt mean just for the 273, i meant small things that have been done over the years to help a car out just a little. And my moms car has 340 manifolds on it and they are going to headers soon so ill probally toss those on the 273, as for carb and intake i had an LD340 layin around and my buddy is letting me borrow his 650 demon....yeah i know its too big but it runs better than the 2bbl ever could. The car is on a pretty decent tune. timing is 8*BTDC and it has new points, plug wires, superstock coil...all stuff we had in the garage. As for going the 360 route my dad donated a virgin 71 340 block,crank,J heads,pistons,rods,main caps, and some other stuff, but it needs to be completely rebuilt so itll have to wait.