Did you calculate the dcr and base the larger cam on the numbers.
United Engine & Machine Co. Incorporated
I use this one its seems to be ok. Sorry dont have a suggestion on the dcr of your combo but with alum heads you canusally run a dcr of 9:1 and be ok a little less for good iron heads. But also depends on the area and temps the car will be drivien at. A car built to run in 100 degree temps needs to have some consideration of these extremes when building.
Not really the best with describing dcr but maybe someone can recommend a safe dcr number for your combo mine was truly a WAG. Since i have never run those heads.