Any gains adding 1.6 rockers to stock 273?

BPTracing said
Everyone keeps mentioning simple things. The Car already has an aftermarket electronic distributor. I have not had the chance to check timing curve rpm. Exhaust is stock manifolds, but aftermarket dual exhaust and Flowmaster mufflers (which I hate due to too much interior noise).

Thank you for that tidbit!!! I was unaware of the need to modify the pushrod holes!

As far as pushrods, I can change the adjusters out to ball style quite easily.
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Ok then why the heck did you even come and ask? You've got your mind already made up. When you spend 300 bucks and there's not one single detectible change, I'm sure you'll come on here bragging about how it has 500HP. We're just trying to save you 300 bucks for basically nothing. Go for it. You've made your mind up.