Another 87 octane/aluminum heads question

It's not an A body but it is a small block, and a somewhat odd combo. I have a '90 360/727 w/4.10 gears in an '86 Ramcharger 4x4.

It's fed with an unmodded swapped in '89 factory TBI. The current engine combo consists of an AirGap intake, shorty headers, mildly ported 72cc 308's, can't recall the cc specs but flat tops .015" in the hole, .038" gasket and a short roller cam. 192/203 @.050'', .459"/.471" lift, 114 LSA. Calculated static is 9.33:1. It's been four years since I screwed it together, can't recall the dynamic CR or the IVC on the cam. Seems like calculated dynamic was around 8.2:1

I run 4* more initial timing than spec on the TBI in ambient temps of up to 115 degrees, a 195 T-stat and 87 octane with no rattles. It has fresh air to the air cleaner and the aforementioned unheated AirGap. The engine temp stays rock steady, new radiator, HD fan and all that.

Here's my issue. I requested the machine shop cut the bowls on the 308's when the new seats were installed and the Chevy idiots cut the bottom angle off the seats. Being pressed for time I installed the heads anyway, crossed my fingers and made the planned trip from Texas to Moab Utah without issue, and have only put about 5000 miles on the engine altogether.

My concern is that since said Chevy idiots reduced the cross section width of the seats they'll eventually worm loose and kill the motor with repeated heat cycles and increased spring pressure.

I want to chunk the 308's and just bolt on a set of Eddy heads, a gain of about a point in compression to 10.3 or so, but with better quench and thermal characteristics. Also going to ditch the factory TBI in favor of an aftermarket setup, that will give me control of the timing curve.

I plan on putting quite a few miles on it in the near future. The thing sucks gas to the tune of about 10mpg on a good day and filling the 35 gallon tank daily with 93 would get painful.

To finally get to the point of this long windedness, think it'll still burn 87 octane with 10.3:1 and a careful tune? Think maybe with a longer cam?