I would love to hear what you find. My head is nothing special. It came off a junkyard 350, is a two bolt main, and the rebuilder told me it had 305 heads on it. I am beginning to think he fibbed and just hit me for more cash.
I have basically stock heads. I have heard from a variety of people, the 1.6 will fit, won't fit, will fit, will rub, won't rub.
The only thing I did to my heads was to run drag line cable with lapping compound through the cast iron headers into the exhaust ports to the valve guide.
She has plenty of guts right now, and gets great fuel mileage. I went really tall rear gears for turnpike cruising so I am building for torque. I get 18-22mpg on the highway now. Not too bad for my project van. Top end is probably going to be about 2200rpm.
If roller tip rockers are true to 1.5, then that might be the trick. I really want just turn key reliability and feel power.