Says 89 or 93 for LS1.  I would run non-eth 89/92/93, whichever was obtainable.  I’m not sure if the manuals were addressing eth vs non-eth back in those days but I would just assume those engines are designed for non-eth fuel.  

No idea about the custom ski ropes but it sounds interesting and I’m sure there are niche suppliers for it similar to fishing rod blanks.  You’ll probably find that the reasonably priced stuff available is suitable for your needs. 

As far as you fuel question goes, the specifications section is likely the best place to find your answer.  🍻 

I’d try asking on Ball of Spray. I don’t see much in the way of individuals custom making their own handles.  But you can buy reasonable handles from S-Lines and Masterline as well. 

24 minutes ago, MLA said:

Im not clear on whats getting into what, but if you plug something into a completely different amplifier and the speakers then play, then those speakers are not connected to the amp you suspect is bad. 

Is this "set" of speakers 2 lefts or 2 rights or 2 fronts or 2 rear? Is this issue on all media modes? Tuner, USB, AUX, BT?

It sounds like you have found a way to make the speakers play by moving or plugging something. This points to the issue is not the speakers and being upstream of the amp. Again, this is based on the info provided. 

Please excuse my bad explanation as I’m not super tech savvy in the stereo department. Currently running two amplifiers. The amp in question has two sets of rca cables and I am only receiving sound from one set. If I swap the rca cables to my second amp I receive sound from both which leads me to believe it’s an amp issue? I could be completely wrong here. I can upload pictures if that would help understand my situation.

Im not receiving any sound from bow of the boat unless I swap rca cables to other amp on any media mode. R or L.

https://ibb.co/W3gpwXg
https://ibb.co/S3vwJR3

16 minutes ago, Samson28 said:

.if I plug into my other amp I get output from the speakers that aren’t working..any ideas?

Im not clear on whats getting into what, but if you plug something into a completely different amplifier and the speakers then play, then those speakers are not connected to the amp you suspect is bad. 

Is this "set" of speakers 2 lefts or 2 rights or 2 fronts or 2 rear? Is this issue on all media modes? Tuner, USB, AUX, BT?

It sounds like you have found a way to make the speakers play by moving or plugging something. This points to the issue is not the speakers and being upstream of the amp. Again, this is based on the info provided.