If you want to drive it on pump gas you will need to lower the CR.My 421 HO was built a 9.5 and I run the 068 cam.If your going to the 4.25 stroke kit you will need to get a accurate CC on your heads after a valve job to know how much dish you are going to need.Your wallet will dictate what kind of cam you want to run.I chose to stay with a hft,all my other engines use hyd roller cams.Your 461 can use 230-236 or a touch more with no issue and drive well in traffic if done on a 112-113.Tom
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