Man, there is plenty of stuff you can do to get more power. First, get a summit catalog at
http://www.summitracing.com
You might wanna start with a new K&N filter, a set of Flowtech afterburner headers and an MSD box, then you can get a starndard rebuild kit or even better a
stroker kit! While rebuilding, you can toss those old cylinder heads and get a a pair of Vortec heads from
http://www.sdpc2000.com. Top it with an Edelbrock Performer intake manifold and Edelbrock Q-jet. If you got big bucks, get the Edelbrock Multipoint fuel injection system instead of the Q-jet. If you plan on sticking with the 33" tires, you should use 3.73 or 4.11 gears.
http://www.4lo.com has a nice table that will help you choose the right gears. A nice rebuild on the tired old tranny, and you got yourself a Blazer many of us dream about.
And tell your father ALL of this will be WAY cheaper than getting a newer Tahoe or Yukon and will be WAY more POWERFUL, STOUTER AND RELIABLE than a second hand vehicle.
Good luck, and I hope you stick with your blazer.
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