When you refer to original steel....do you mean a forged/steel or are you talking about a cast crank ?

The swap to a stroker crank costs a little more, but is usually worth the cost in added power,not sure how much of a stroke that block will handle without clearancing issues.......

Usually on a engine of that year you will be swaping the pistons/ rods to a different compression ratio......


The more information you provide the better the people here will be able to help.

Hope this helps you get started.