I have a single plane victor jr. on my 355 powered '65 chevelle conv't (not to be confused with my 66 zz502 hard top, hence the name GLEN
anyway, it came on the car when I bought it and it sux.. No power until ~3000 RPM and with a stock low gear and auto trans = snotty rice burner coffee can muffler kid gets you off the line every time. I just ordered a dual plane idle-5800 rated intake. The car is just a cruiser, not a racer but that doesn't mean I can live with seeing the back end of a clapped out 1990 honda either... If you are driving on the street stick with the dual plane.. .