New spark plugs,wires,injectors, coil,pcm still misfire and hes. Shop say valve?

We cant guess at anything else, when a repair shop has actually checked your vehicle! You can post results of compression test and other conclusions you get from the shop. We will be glade to advise!

Are the Front catalytic converters clear?

If he didn't do the gold standard cylinder leak down test you're wasting your time and money + your mechanic shouldn't be guessing like that. Leak down test is the only sure way to verify need for a valve job and a better solution if indeed that's the case- go purchase a used/ or rebuilt cylinder head and skip the valve job. Then all you need is a head gasket. A used head's about $100 or less, gasket = $35. Labor maybe $75-$125/hr but at least you know that's a set price via book time. book time may say 6 hours so do the math and yeah....lot's less than $2500. First thing I'd do is take it elsewhere.