On the front, you want a softer spring. it will compressmore and store more energy. The 175's just did not transfer the weight well enough. The 150's made a big difference. I don't have much weight up front, manual steering, hood, relocated battery, etc. So with the added weight of your 351 and depending on how heavy the front is, 175's might work for you. If you are going to coilovers, you need cc plates as all the front end weight will now be supported there. It's not a matter of needing more adjustment, but needing something stronger than stock.
I went with 70/30 lakewoods. If you are going to drive it on the street a lot, that might be a safer option. But if you want to pull the tires high, the 90/10's will definately help.
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93 GT-11.8@116
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