If I was building a motor on a tight budget I would skip the cool head and have a stock head milled. Then take the 200 you saved on the cool head and put it twards the port job.
Pipes, and Porting are the 2 biggest modds that will give you the most power per dollar spent.
You have 3 options with the timing plate. The $100 billit plate from Pro Designe, $50 billit plate from Chariot Perfomance (ebay), or the $35 cast aluminum plate from ricky stator. I run the Pro Design plate. I wanted a billit plate and found it use for $40 bucks. I wouldnt have spent that money for a new one. I would have went with the Chariot plate for $50.
Since you ALREADY have the T6's get the port job of your choice and try it out. No sence in spending the money you were going to put down for a port job on new pipes and have a marginal gain vs. the huge gain you would have gotten with a port job. Sure they might not be the Ideal pipe but they can be changed later. It isnt costing you any more mony leaving them on there.