camshaft for 225

The largest cam in a factory 225 was the mid 70's to 1980 solid cam before they went to a Hydraulic. The comp you have is a good replacement but will need valve springs to go with it. The Comp #64-241-4 has a .440/.440 lift with 220/220/ @.050 Duration.The lift on a factory cam is in the .375 ball park.
This can be used in a basic stock 225 without any problem. If you decide to remove the head for spring replacement, You,if you have a budget for it should go thru the valves with a basic valve job.Have the head milled a minimum of .060 to .100 max to up the compression.NOW This is just for a BASIC performance improvement.
As AJ/FormS stated above,now the snow ball effect comes into play with many more components.