It shouldn't be any harder than putting the cast Greddy manifold on. I just used an open ended wrench and got them as tight as I could. I am pretty sure you can do it with basic tools, so keep trying.

 

I used a wrench and started from the inside and went out then back in again. I got them really snug. I had to grind off a little of the head on the two center bolts because they were hitting the weld on the manifold and wouldnt not go in all the way but I got that taken care of and the manifold is on and tight I really appreciate it.

I did however run into another problem. The aftermarket electric oil pressure gauge I bought has a huge sending unit and will not allow my oil filter to go back on. Can I get a smaller diameter oil filter with the same threads and be ok????