Hey, my friend wants to sell me his edelbrock runners, and his highflo base to me for around $300. I have a stock '91 305 Lb9 w/ 0 miles bored .30over and was wondering if this would improve hp or tq much? I am going to remove the egr walls in the plenum and siamese the runners at the plenum. Are the parts worth it? will my mileage decrease with these mods? Let me know. Thanks.

 

I also have an extra LT1 intake sitting around, should I just modify that instead? would the gains be about the same?