Ram's horns - will they fit?

[truckinbean]

I need to know if the angled dump ram's horns will fit in my '77 blazer without any modifications. I know the straight dump ones you have to cut on the engine mount.

Has anyone else used these in a 73-87?

I want to use them because I have some shorty style headers on it now and the header ping annoys the hell out of me. I also want to know if it will have any effect on my gas mileage. I don't really go over 3k rpm so I'm not concerned about losing any power in the upper range.

Thanks in advance,

Ben