Hi, thanks!
So in the end, SWIM simply chewed 340 Heavenly Blue seeds and just let the chewed up mush absorb in his mouth (in two batches), over an hour, before spitting out the seed-mush.
Within about 3 hours, SWIM was sedated and stoned, in a pleasant and warm way. (There were no negative side-effects)
It was again, about equivalent of smoking 2 joints of an enjoyable indica strain, except with the delayed 3 hours of onset time.
It was a pleasant and heavy sedation like from smoking an indica strain, with some imaginative expansion. (Food also tasted much better).
The only somewhat psychedelic aspect, is that at one point SWIM started remembering early childhood memories, and was able to recall these memories in great detail. (Although SWIM also gets this from weed). Otherwise, there was no psychedelic effect at this dose.
The next day, on waking up in the morning, there was still a significant sedation, making it difficult to leave the bed and move.
(So make sure you have at least 14 hours after taking the dose, in which you don't have to drive a car or operate machinery.)
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Overall, SWIM has found this pleasantly very similar in its effects to (sedative strains of) weed. It could almost become quite addictive.
By chewing and spitting out the mush (after sufficient time given to absorb this mush sublingually), there were no negative side-effects besides numbing of the tongue. He believes the negative side effects of Morning Glory seeds, are all a result of swallowing the seed mush, and that by not swallowing, these can be avoided.
Next time - SWIM will attempt to increase the sublingual dosage to around 450 seeds.