I'm pulling the mill from my Daily Driver '88 GT next week for a rebuild and have an opportunity to purchase the following TrickFlow setup for a good price:
There are plenty of people right here running the very same set up and producing the hp/tq your looking for. I have a friend with the stage 1 cam and street heat and it is very well manered on the street. If its a good price and it will fit what you want I;d say go with it.
Looks like the "Street Heat" kit that they sell. It made 350/370 flywheel hp on their test engine, which should be able to make 300 rwhp with a good tune.