I decided to have Muscle Motors build me a new 540" short block. I recently bought a new hemi ram truck and sold my daily driver. the money from the car I sold is to be used for motor upgrades. I am going to sell my 496" short block. I plan on useing as much of the top end as possible. the EZs are fully ported an will get a bigger valve to help with flow. I know these heads will not get me the most power but it fits in the budget right now. I hope to get 800 or so hp with this combination. this will be a high compression motor with a big roller cam. this is all going into a new World aluminum block. the Roadrunner should weigh around 3400lbs with me in it with the new block. I hope to be running mid 9s with this combo. I need to go to a 4.56 gear from the 4.10 and either loosen my existing converter or maybe have to go to an 8" converter. I presently have a Dynamic 9.5' 4200 stall. I will keep you informed as things progress.