I have a 69 dart with 915 heads and tti/pro parts headers . I,m looking at putting trick flow 240,s on my engine just wondering if any one has done it yet. I talked to bob mazzolini he said he has not done it so he can,t say for sure they will work . I talked to tti they say they should work. I,m looking for someone that has done it to give me the ok they work. 5 and 6 cylinder are the plugs I,m worried about being to close with them being on a angle all the rest look like they will clear the headers. Thanks scott