So I did it... it wasn't just a cam and spring change in the end... I did:
- changed the xe276hr to the OF cam from Butler
- replaced valve springs (with Edelbrock 5845.) using the Proform 66784 tool.. wasn't too hard with engine in the car
- replaced valve seals
- gasket matched the RPM intake
- build new wires and connectors for the EFI
Because of bad weather I couldn't do much testing, but it clearly feels stronger and it runs really nice...idling at 800rpm without any issue and no problem with vacuum.
If anyone with a 455 is wondering, if the old faithfull cam is too big... don't worry... I'm pretty sure a tighter LSA would also be streetable.. mine has 236/242/114.
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