Economical replacement rocker arm set?

Highly unlikely that the rockers make less power. If you know what the lift is you can measure it at the retainer and see how close it is.

I know the stamped rockers are almost never 1.5 ratio. The last set I checked (probably 1985) they were 1.42. Most of them I checked were about 1.45.

Most of those style rockers I've checked are no less than 1.48 and I've had some that were 1.53.

I don't think my cousin ever checked those but the car went .04-.05 quicker with those rockers.