increase HP on a 273

Check the Engine issues forum there is a lot if information on the 273 build there. Here is what I am doing to mine.
Bored 30, deck block and shave heads, balance, 9:1 compression, Custom ground solid lifter cam with specs 20% more that the original 235 hp 4v Commando engine, Eddy performer dual plane intake, Holly 4V carb W/vacume secondaries, Dougs headers and Pertronix ignition conversion. I will build the stock 904 to take a little extra hp and if I can find an a body 8 3/4 so I can get SL I will have what I am after-------Good luck with yours-----
JMHO Rat