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Re: I need more power :)
you could gain a good 30 horsepower from vortec heads http://www.summitracing.com/parts/NAL-12558060/(read the discription at the bottem) but they require a differnt manifold that what you have stock. you will also need self aligining rocker arms but then you could go to roller rockers and pick up more power. and add a set of headers and a new chip custom built for the set up and you should have a good bit over 50 horse power.
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77 chevy BIG 10 350/sm465/12bolt w 3.73 bout 240 horse power NO power steerin
79 chevy 1/2 ton 250/three on the tree/3.08s soon to get built 250/floor shift conversion/3.08s
81 mercedes 300d 25 MPG
77 chevy BIG DOOLEY 454/sm-465/14 bolt 4.10s "fully loaded"
73 plymouth duster 225 slant six/230 3 speed/8 1/4 trying to acheve 300 horse six http://www.cardomain.com/ride/3135091
'77 chevy trucks. built to stay tough.
life is short build a hot rod 
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