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I think the H is there and No Difference the SE 203 is the same as far as I know..
Go read here:
http://www.bigboyzheadporting.com/calculators.htm
This will tell you about the cams so YOU can figure it out... I personally would of gone with the se204 cam... A little More Low end torque com'n on a little earlier as the intake close is 30* and I like the .508" lift on both intake-exhaust
I think you are going to be disappointed EXPECTING BIG Things from JUST a Cam...
The engine Needs a total package to gain enough to REALLY do anything....... Cams by them selves will Help but NOT doing what I read around your question to do..... I might be Wrong in thinking YOUR thinking BUT........
Read about what others have done and KNOW what you want Before you Jump into a Part, Just to put it in,,,,, as IT IS just PART of the TOTAL equation....
Yes that cam will give you a CHANGE but is it enough to do what you want?
It needs exhaust and More Air to go along with and My suggestion Then is a TFI for a little more fuel.. These THREE things along with the CAM will give good results
signed....BUBBIE