i think its blowed

thank you how will i go about determing what length pushrod to use i had in mind that comp had some off the shelf that would fit my app PN 7821-16 they are for hydraulic lifters and asjustible rockers is this wrong i have plans on calling comp to get the run down on the pushrods. but what do you think and when i install the shafts ( i just want to make sure) i mount them with the oil holes down facing the bottom of the rocker correct just like the factory units also do you think i am going to be able to run the valve springs i currently have they are fine for the lift of my cam and a little more but am i going to gain enough lift out of this swap to cause any coil bind