If all you are going to change is the heads and cam, don't use heads with anything near 2.02 valves. Keep the stock valve sizes in your L48.
I'd take your stock heads off, have them treated to a street high-performance port and polish then add a mild aftermarket cam from Crane. I'd use a "small" hyd. roller. I'd also use the valves springs, lifters and pushrods recommended by Crane.
A combination such as that will work well with the low compression, low-performance intake manifold and stock exhaust.
As for the "size" of the job, that depends on your skills and experience working on cars. If you're not at least an "intermediate DIY" I'd pass on the job unless you're willing to use your own car to learn on. Even then, solid basic mechanical knowlege, skill working with machanical things and a factory service manual are. As for cost, as long as the short block of the engine is in good condition, the parts and head work probably will run you a $1500-2000. If the engine is high-mileage, you need to overhaul the rest of the engine at the same time and you need to figure on 3500-4000. You could expect 20-30 hp gain.
