Mild build up for 87 350 questions

[87chevyk10]

Hi, I have a 1987 350 tbi (L05). I want good torque and gas mileage. Right now I have RPC long tube headers that I did not put on yet but am planning on to put them on sometime this weekend. It also has flowmaster 40 series on. I am planning on getting vortec heads and and a good cam but don't know what type of cam to get? So what's a good cam that gives good torque but gets good gas mileage. What other things can i do without breaking the bank or boring out my engine or stroking it? This truck is a daily driving and I will use it to tow a little. What will be the estimated torque and horsepower after I am done?
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